<template>
	<view>
		<!-- 使用自定义的搜索组件 -->
		<my-search @click="gotoSearch()"></my-search>
		
		<view class="scroll-view-container">
			<!-- 左侧区域 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
				<block v-for="(item, index) in cateList" :key="index">
					<view :class="['left-scroll-view-item', index === active ? 'active' : '']"
						@click="activeChanged(index)">{{item.cat_name}}</view>
				</block>
			</scroll-view>

			<!-- 右侧区域 -->
			<scroll-view class="right-scroll-view-item" scroll-y="true" :style="{height: wh + 'px'}"
				:scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2, i2) in cateListLevel2" :key="i2">
					<!-- 二级分类标题 -->
					<view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
					<!-- 二级下的三级分类 -->
					<view class="cate-lv3-list">
						<!-- 三级分类的item项 -->
						<view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3"
							@click="gotoGoodsList(item3)">
							<!-- 三级分类图片 -->
							<image :src="item3.cat_icon"></image>
							<!-- 三级分类文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				// 当前设备可用高度
				wh: 0,
				cateList: [],
				active: 0,
				cateListLevel2: [],
				scrollTop: 0
			};
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight - 50
			this.getCateList()
		},
		methods: {
			async getCateList() {
				const res = await uni.$http.get('front/getCateList')
				// 请求失败
				if (res.data.code != 0) return uni.$showMsg()
				var cateList = JSON.parse(res.data.data)
				this.cateList = cateList

				// 为二级分类赋值
				this.cateListLevel2 = cateList[0].children
				console.log(this.cateListLevel2)
			},
			activeChanged(index) {
				this.active = index
				this.cateListLevel2 = this.cateList[index].children
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			gotoGoodsList(item3) {
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
				})
			},
			gotoSearch(){
				uni.navigateTo({
					url: '/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;
	}

	.left-scroll-view {
		width: 120px;

		.left-scroll-view-item {
			background-color: #f7f7f7;
			line-height: 60px;
			text-align: center;
			font-size: 12px;

			&.active {
				background-color: #ffffff;
				position: relative;

				&::before {
					content: ' ';
					display: block;
					width: 3px;
					height: 30px;
					background-color: #C00000;
					position: absolute;
					top: 50%;
					left: 0;
					transform: translateY(-50%);
				}
			}
		}
	}

	.cate-lv2-title {
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}

	.cate-lv3-list {
		display: flex;
		flex-wrap: wrap;

		.cate-lv3-item {
			width: 33.33%;
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;
			margin-bottom: 10px;

			image {
				width: 60px;
				height: 60px;
			}

			text {
				font-size: 12px;
			}
		}
	}
</style>
